NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T12:03:13 PDT
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For refcode 2014AJ....148...41B:
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2014AJ....148...41B A Search for Supernova Remnants in NGC 6946 Using the [Fe II] 1.64 micron Line Bruursema, Justice; Meixner, Margaret; Long, Knox S.; Otsuka, Masaaki Abstract. Shock models indicate and observations show that in the infrared (IR), supernova remnants (SNRs) emit strongly in [Fe II] at 1.64 micron. Here, we report the results of a search for SNRs in NGC 6946 relying on [Fe II] 1.64 micron line emission, where we employed an adjacent [Fe II]_Off_ filter to accurately assess the local continuum levels. For this study, we used the WIYN High Resolution Infrared Camera on the WIYN 3.5 m telescope to image NGC 6946 in broadbands J and H and narrowbands [Fe II], [Fe II]_Off_, Pabeta, and Pabeta_Off_. From our search, we have identified 48 SNR candidates (SNRcs), 6 of which are coincident with sources found in prior radio, optical, and/or X-ray studies. The measured [Fe II] fluxes of our SNRcs range from 1.5 x 10^-16^ to 4.2 x 10^-15^ erg s^-1^ cm^-2^ and are among the highest of previously published extragalactic SNR [Fe II] fluxes. All of the candidates now need to be confirmed spectroscopically. However, the fact that we detect as many objects as we did suggests that [Fe II] can be used as an effective search tool to find extragalactic SNRs. Key words: galaxies: individual: NGC 6946, ISM: supernova remnants
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